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DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver
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11.6 Ethernet Interface Registers
The Ethernet Interface registers are used to configure RMII/MII bus operation and establish the MAC parameters
as required by the user. The MAC Registers cannot be addressed directly from the Processor port. The registers
below are used to perform indirect read or write operations to the MAC registers. The MAC Status Registers are
shown in
Table 11-7. Accessing the MAC Registers is described in the Section 9.15.
11.6.1 Ethernet Interface Register Bit Descriptions
Register Name:
SU.MACRADL
Register Description:
MAC Read Address Low Register
Register Address:
140h
Bit # 7 6 5 4 3 2 1 0
Name MACRA7 MACRA6 MACRA5 MACRA4 MACRA3 MACRA2 MACRA1 MACRA0
Default 0 0 0 0 0 0 0 0
Bits 0 – 7: MAC Read Address (MACRA0-7) Low byte of the MAC indirect register address. Used only for read
operations.
Register Name:
SU.MACRADH
Register Description:
MAC Read Address High Register
Register Address:
141h
Bit # 7 6 5 4 3 2 1 0
Name MACRA1
5
MACRA1
4
MACRA1
3
MACRA1
2
MACRA1
1
MACRA1
0
MACRA9 MACRA8
Default 0 0 0 0 0 0 0 0
Bits 0 – 7: MAC Read Address (MACRA8-15) High byte of the MAC indirect register address. Used only for read
operations.
Register Name:
SU.MACRD0
Register Description:
MAC Read Data Byte 0
Register Address:
142h
Bit # 7 6 5 4 3 2 1 0
Name MACRD7 MACRD6 MACRD5 MACRD4 MACRD3 MACRD2 MACRD1 MACRD0
Default 0 0 0 0 0 0 0 0
Bits 0 – 7: MAC Read Data 0 (MACRD0-7) One of four bytes of data read from the MAC. Valid after a read
command has been issued and the
SU.MACRWC.MCS bit is zero.